Open back hat



FIG. 1 is a front side elevation view of an open back hat showing the new design;

FIG. 2 is a closed back rear side elevation view thereof;

FIG. 3 is an open back rear elevation view thereof;

FIG. 4 is a front perspective view thereof;

FIG. 5 is a closed back rear perspective view thereof;

FIG. 6 is a closed back top plan view thereof;

FIG. 7 is closed back bottom plan view thereof.

FIG. 8 is a closed back left perspective view thereof; and,

FIG. 9 is a closed back right perspective view thereof.

The broken lines depict environmental features that form no part of the claimed design. 

CLAIM The ornamental design for an open back hat, as shown and described. 